blob: ace25c4047b0f1dc5e6a969ee927eca596c8e7cb [file] [log] [blame]
Darren Tuckerb422afa2009-06-21 18:58:46 +10001/* $OpenBSD: monitor.c,v 1.104 2009/06/12 20:43:22 andreas Exp $ */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002/*
3 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
4 * Copyright 2002 Markus Friedl <markus@openbsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "includes.h"
Damien Miller9cf6d072006-03-15 11:29:24 +110029
30#include <sys/types.h>
Damien Miller8dbffe72006-08-05 11:02:17 +100031#include <sys/param.h>
Damien Millere3b60b52006-07-10 21:08:03 +100032#include <sys/socket.h>
Damien Millerd7834352006-08-05 12:39:39 +100033#include "openbsd-compat/sys-tree.h"
Damien Miller9cf6d072006-03-15 11:29:24 +110034#include <sys/wait.h>
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000035
Darren Tucker39972492006-07-12 22:22:46 +100036#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100037#include <fcntl.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110038#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110039#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110040#endif
Damien Miller9f2abc42006-07-10 20:53:08 +100041#include <pwd.h>
Damien Miller6ff3cad2006-03-15 11:52:09 +110042#include <signal.h>
Damien Millerded319c2006-09-01 15:38:36 +100043#include <stdarg.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100044#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100045#include <string.h>
Damien Miller607aede2006-09-01 15:48:19 +100046#include <unistd.h>
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000047
48#ifdef SKEY
49#include <skey.h>
50#endif
51
Damien Miller03e20032006-03-15 11:16:59 +110052#include <openssl/dh.h>
53
Damien Millerb84886b2008-05-19 15:05:07 +100054#include "openbsd-compat/sys-queue.h"
Damien Millerd7834352006-08-05 12:39:39 +100055#include "xmalloc.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000056#include "ssh.h"
Damien Millerd7834352006-08-05 12:39:39 +100057#include "key.h"
58#include "buffer.h"
59#include "hostfile.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000060#include "auth.h"
Damien Millerd7834352006-08-05 12:39:39 +100061#include "cipher.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000062#include "kex.h"
63#include "dh.h"
Ben Lindstrom036768e2004-04-08 16:12:30 +000064#ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
65#undef TARGET_OS_MAC
Ben Lindstrom1b9f2a62004-04-08 05:11:03 +000066#include "zlib.h"
Ben Lindstrom036768e2004-04-08 16:12:30 +000067#define TARGET_OS_MAC 1
68#else
69#include "zlib.h"
70#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000071#include "packet.h"
72#include "auth-options.h"
73#include "sshpty.h"
74#include "channels.h"
75#include "session.h"
76#include "sshlogin.h"
77#include "canohost.h"
78#include "log.h"
79#include "servconf.h"
80#include "monitor.h"
81#include "monitor_mm.h"
Damien Millerd7834352006-08-05 12:39:39 +100082#ifdef GSSAPI
83#include "ssh-gss.h"
84#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000085#include "monitor_wrap.h"
86#include "monitor_fdpass.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000087#include "misc.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000088#include "compat.h"
89#include "ssh2.h"
Damien Miller01ed2272008-11-05 16:20:46 +110090#include "jpake.h"
Darren Tuckerb422afa2009-06-21 18:58:46 +100091#include "roaming.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000092
Darren Tucker0efd1552003-08-26 11:49:55 +100093#ifdef GSSAPI
Darren Tucker0efd1552003-08-26 11:49:55 +100094static Gssctxt *gsscontext = NULL;
95#endif
96
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000097/* Imports */
98extern ServerOptions options;
99extern u_int utmp_len;
100extern Newkeys *current_keys[];
101extern z_stream incoming_stream;
102extern z_stream outgoing_stream;
103extern u_char session_id[];
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000104extern Buffer auth_debug;
105extern int auth_debug_init;
Darren Tucker09991742004-07-17 17:05:14 +1000106extern Buffer loginmsg;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000107
108/* State exported from the child */
109
110struct {
111 z_stream incoming;
112 z_stream outgoing;
113 u_char *keyin;
114 u_int keyinlen;
115 u_char *keyout;
116 u_int keyoutlen;
117 u_char *ivin;
118 u_int ivinlen;
119 u_char *ivout;
120 u_int ivoutlen;
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000121 u_char *ssh1key;
122 u_int ssh1keylen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000123 int ssh1cipher;
124 int ssh1protoflags;
125 u_char *input;
126 u_int ilen;
127 u_char *output;
128 u_int olen;
Darren Tuckerc5564e12009-06-21 18:53:53 +1000129 u_int64_t sent_bytes;
130 u_int64_t recv_bytes;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000131} child_state;
132
Damien Miller469954d2003-06-18 20:25:33 +1000133/* Functions on the monitor that answer unprivileged requests */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000134
135int mm_answer_moduli(int, Buffer *);
136int mm_answer_sign(int, Buffer *);
137int mm_answer_pwnamallow(int, Buffer *);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000138int mm_answer_auth2_read_banner(int, Buffer *);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000139int mm_answer_authserv(int, Buffer *);
140int mm_answer_authpassword(int, Buffer *);
141int mm_answer_bsdauthquery(int, Buffer *);
142int mm_answer_bsdauthrespond(int, Buffer *);
143int mm_answer_skeyquery(int, Buffer *);
144int mm_answer_skeyrespond(int, Buffer *);
145int mm_answer_keyallowed(int, Buffer *);
146int mm_answer_keyverify(int, Buffer *);
147int mm_answer_pty(int, Buffer *);
148int mm_answer_pty_cleanup(int, Buffer *);
149int mm_answer_term(int, Buffer *);
150int mm_answer_rsa_keyallowed(int, Buffer *);
151int mm_answer_rsa_challenge(int, Buffer *);
152int mm_answer_rsa_response(int, Buffer *);
153int mm_answer_sesskey(int, Buffer *);
154int mm_answer_sessid(int, Buffer *);
Damien Miller01ed2272008-11-05 16:20:46 +1100155int mm_answer_jpake_get_pwdata(int, Buffer *);
156int mm_answer_jpake_step1(int, Buffer *);
157int mm_answer_jpake_step2(int, Buffer *);
158int mm_answer_jpake_key_confirm(int, Buffer *);
159int mm_answer_jpake_check_confirm(int, Buffer *);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000160
Damien Miller79418552002-04-23 20:28:48 +1000161#ifdef USE_PAM
162int mm_answer_pam_start(int, Buffer *);
Damien Miller1f499fd2003-08-25 13:08:49 +1000163int mm_answer_pam_account(int, Buffer *);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000164int mm_answer_pam_init_ctx(int, Buffer *);
165int mm_answer_pam_query(int, Buffer *);
166int mm_answer_pam_respond(int, Buffer *);
167int mm_answer_pam_free_ctx(int, Buffer *);
Damien Miller79418552002-04-23 20:28:48 +1000168#endif
169
Darren Tucker0efd1552003-08-26 11:49:55 +1000170#ifdef GSSAPI
171int mm_answer_gss_setup_ctx(int, Buffer *);
172int mm_answer_gss_accept_ctx(int, Buffer *);
173int mm_answer_gss_userok(int, Buffer *);
Damien Miller0425d402003-11-17 22:18:21 +1100174int mm_answer_gss_checkmic(int, Buffer *);
Darren Tucker0efd1552003-08-26 11:49:55 +1000175#endif
Damien Miller25162f22002-09-12 09:47:29 +1000176
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100177#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100178int mm_answer_audit_event(int, Buffer *);
179int mm_answer_audit_command(int, Buffer *);
180#endif
181
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000182static Authctxt *authctxt;
183static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
184
185/* local state for key verify */
186static u_char *key_blob = NULL;
187static u_int key_bloblen = 0;
188static int key_blobtype = MM_NOKEY;
Damien Millera10f5612002-09-12 09:49:15 +1000189static char *hostbased_cuser = NULL;
190static char *hostbased_chost = NULL;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000191static char *auth_method = "unknown";
Darren Tucker502d3842003-06-28 12:38:01 +1000192static u_int session_id2_len = 0;
Ben Lindstromf67e0772002-06-06 20:58:19 +0000193static u_char *session_id2 = NULL;
Damien Millerbe64d432003-05-14 19:31:12 +1000194static pid_t monitor_child_pid;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000195
196struct mon_table {
197 enum monitor_reqtype type;
198 int flags;
199 int (*f)(int, Buffer *);
200};
201
202#define MON_ISAUTH 0x0004 /* Required for Authentication */
203#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
204#define MON_ONCE 0x0010 /* Disable after calling */
Damien Miller7a8f5b32006-03-31 23:14:23 +1100205#define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000206
207#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
208
209#define MON_PERMIT 0x1000 /* Request is permitted */
210
211struct mon_table mon_dispatch_proto20[] = {
212 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
213 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
214 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
215 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
Damien Miller5ad9fd92002-05-13 11:07:41 +1000216 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000217 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
Damien Miller79418552002-04-23 20:28:48 +1000218#ifdef USE_PAM
219 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
Damien Miller1f499fd2003-08-25 13:08:49 +1000220 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
Damien Miller4f9f42a2003-05-10 19:28:02 +1000221 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
222 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
223 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
224 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
Kevin Stevesbd1901b2002-04-01 18:04:35 +0000225#endif
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100226#ifdef SSH_AUDIT_EVENTS
Darren Tucker3745e2b2005-03-06 22:31:35 +1100227 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100228#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000229#ifdef BSD_AUTH
230 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
Damien Miller0b70b542006-03-15 11:20:03 +1100231 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000232#endif
233#ifdef SKEY
234 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
235 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
236#endif
237 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
238 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
Darren Tucker0efd1552003-08-26 11:49:55 +1000239#ifdef GSSAPI
240 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
241 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
242 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
Damien Miller0425d402003-11-17 22:18:21 +1100243 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
Darren Tucker0efd1552003-08-26 11:49:55 +1000244#endif
Damien Miller01ed2272008-11-05 16:20:46 +1100245#ifdef JPAKE
246 {MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata},
247 {MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1},
248 {MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2},
249 {MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm},
250 {MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm},
251#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000252 {0, 0, NULL}
253};
254
255struct mon_table mon_dispatch_postauth20[] = {
256 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
257 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
258 {MONITOR_REQ_PTY, 0, mm_answer_pty},
259 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
260 {MONITOR_REQ_TERM, 0, mm_answer_term},
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100261#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100262 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
263 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
264#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000265 {0, 0, NULL}
266};
267
268struct mon_table mon_dispatch_proto15[] = {
269 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
270 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
271 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
272 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
Damien Miller7a8f5b32006-03-31 23:14:23 +1100273 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
274 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000275 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
276 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
277#ifdef BSD_AUTH
278 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
Damien Miller0b70b542006-03-15 11:20:03 +1100279 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000280#endif
281#ifdef SKEY
282 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
283 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
284#endif
Damien Millera33501b2002-05-08 12:24:42 +1000285#ifdef USE_PAM
286 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
Damien Miller1f499fd2003-08-25 13:08:49 +1000287 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
Damien Miller4f9f42a2003-05-10 19:28:02 +1000288 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
289 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
290 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
291 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
Damien Millera33501b2002-05-08 12:24:42 +1000292#endif
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100293#ifdef SSH_AUDIT_EVENTS
Darren Tucker3745e2b2005-03-06 22:31:35 +1100294 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100295#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000296 {0, 0, NULL}
297};
298
299struct mon_table mon_dispatch_postauth15[] = {
300 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
301 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
302 {MONITOR_REQ_TERM, 0, mm_answer_term},
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100303#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100304 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
Darren Tucker5965ae12006-09-17 12:00:13 +1000305 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command},
Darren Tucker269a1ea2005-02-03 00:20:53 +1100306#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000307 {0, 0, NULL}
308};
309
310struct mon_table *mon_dispatch;
311
312/* Specifies if a certain message is allowed at the moment */
313
314static void
315monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
316{
317 while (ent->f != NULL) {
318 if (ent->type == type) {
319 ent->flags &= ~MON_PERMIT;
320 ent->flags |= permit ? MON_PERMIT : 0;
321 return;
322 }
323 ent++;
324 }
325}
326
327static void
328monitor_permit_authentications(int permit)
329{
330 struct mon_table *ent = mon_dispatch;
331
332 while (ent->f != NULL) {
333 if (ent->flags & MON_AUTH) {
334 ent->flags &= ~MON_PERMIT;
335 ent->flags |= permit ? MON_PERMIT : 0;
336 }
337 ent++;
338 }
339}
340
Darren Tucker3e33cec2003-10-02 16:12:36 +1000341void
342monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000343{
344 struct mon_table *ent;
345 int authenticated = 0;
346
347 debug3("preauth child monitor started");
348
Darren Tucker3e33cec2003-10-02 16:12:36 +1000349 authctxt = _authctxt;
350 memset(authctxt, 0, sizeof(*authctxt));
351
Darren Tuckerde0de392005-03-31 23:52:04 +1000352 authctxt->loginmsg = &loginmsg;
353
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000354 if (compat20) {
355 mon_dispatch = mon_dispatch_proto20;
356
357 /* Permit requests for moduli and signatures */
358 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
359 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
360 } else {
361 mon_dispatch = mon_dispatch_proto15;
362
363 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
364 }
365
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000366 /* The first few requests do not require asynchronous access */
367 while (!authenticated) {
Damien Miller7a8f5b32006-03-31 23:14:23 +1100368 auth_method = "unknown";
Darren Tuckerfbba7352006-11-07 23:16:08 +1100369 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000370 if (authenticated) {
371 if (!(ent->flags & MON_AUTHDECIDE))
372 fatal("%s: unexpected authentication from %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000373 __func__, ent->type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000374 if (authctxt->pw->pw_uid == 0 &&
375 !auth_root_allowed(auth_method))
376 authenticated = 0;
Damien Miller1f499fd2003-08-25 13:08:49 +1000377#ifdef USE_PAM
378 /* PAM needs to perform account checks after auth */
Damien Miller6aef38f2003-11-18 10:45:20 +1100379 if (options.use_pam && authenticated) {
Damien Miller1f499fd2003-08-25 13:08:49 +1000380 Buffer m;
381
382 buffer_init(&m);
Damien Millera8e06ce2003-11-21 23:48:55 +1100383 mm_request_receive_expect(pmonitor->m_sendfd,
Damien Miller1f499fd2003-08-25 13:08:49 +1000384 MONITOR_REQ_PAM_ACCOUNT, &m);
385 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
386 buffer_free(&m);
387 }
388#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000389 }
390
Damien Miller7a8f5b32006-03-31 23:14:23 +1100391 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000392 auth_log(authctxt, authenticated, auth_method,
393 compat20 ? " ssh2" : "");
394 if (!authenticated)
395 authctxt->failures++;
396 }
Damien Miller01ed2272008-11-05 16:20:46 +1100397#ifdef JPAKE
398 /* Cleanup JPAKE context after authentication */
399 if (ent->flags & MON_AUTHDECIDE) {
400 if (authctxt->jpake_ctx != NULL) {
401 jpake_free(authctxt->jpake_ctx);
402 authctxt->jpake_ctx = NULL;
403 }
404 }
405#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000406 }
407
408 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000409 fatal("%s: authenticated invalid user", __func__);
Damien Miller7a8f5b32006-03-31 23:14:23 +1100410 if (strcmp(auth_method, "unknown") == 0)
411 fatal("%s: authentication method name unknown", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000412
413 debug("%s: %s has been authenticated by privileged process",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000414 __func__, authctxt->user);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000415
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000416 mm_get_keystate(pmonitor);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000417}
418
Damien Millerbe64d432003-05-14 19:31:12 +1000419static void
420monitor_set_child_handler(pid_t pid)
421{
422 monitor_child_pid = pid;
423}
424
425static void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000426monitor_child_handler(int sig)
Damien Millerbe64d432003-05-14 19:31:12 +1000427{
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000428 kill(monitor_child_pid, sig);
Damien Millerbe64d432003-05-14 19:31:12 +1000429}
430
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000431void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000432monitor_child_postauth(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000433{
Damien Millerbe64d432003-05-14 19:31:12 +1000434 monitor_set_child_handler(pmonitor->m_pid);
435 signal(SIGHUP, &monitor_child_handler);
436 signal(SIGTERM, &monitor_child_handler);
Darren Tucker7fa339b2007-05-20 15:10:16 +1000437 signal(SIGINT, &monitor_child_handler);
Damien Millerbe64d432003-05-14 19:31:12 +1000438
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000439 if (compat20) {
440 mon_dispatch = mon_dispatch_postauth20;
441
442 /* Permit requests for moduli and signatures */
443 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
444 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
445 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000446 } else {
447 mon_dispatch = mon_dispatch_postauth15;
448 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
449 }
450 if (!no_pty_flag) {
451 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
452 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
453 }
454
455 for (;;)
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000456 monitor_read(pmonitor, mon_dispatch, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000457}
458
459void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000460monitor_sync(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000461{
Damien Miller2d6b8332002-06-21 15:59:49 +1000462 if (options.compression) {
463 /* The member allocation is not visible, so sync it */
464 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
465 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000466}
467
468int
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000469monitor_read(struct monitor *pmonitor, struct mon_table *ent,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000470 struct mon_table **pent)
471{
472 Buffer m;
473 int ret;
474 u_char type;
475
476 buffer_init(&m);
477
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000478 mm_request_receive(pmonitor->m_sendfd, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000479 type = buffer_get_char(&m);
480
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000481 debug3("%s: checking request %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000482
483 while (ent->f != NULL) {
484 if (ent->type == type)
485 break;
486 ent++;
487 }
488
489 if (ent->f != NULL) {
490 if (!(ent->flags & MON_PERMIT))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000491 fatal("%s: unpermitted request %d", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000492 type);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000493 ret = (*ent->f)(pmonitor->m_sendfd, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000494 buffer_free(&m);
495
496 /* The child may use this request only once, disable it */
497 if (ent->flags & MON_ONCE) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000498 debug2("%s: %d used once, disabling now", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000499 type);
500 ent->flags &= ~MON_PERMIT;
501 }
502
503 if (pent != NULL)
504 *pent = ent;
505
506 return ret;
507 }
508
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000509 fatal("%s: unsupported request: %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000510
511 /* NOTREACHED */
512 return (-1);
513}
514
515/* allowed key state */
516static int
517monitor_allowed_key(u_char *blob, u_int bloblen)
518{
519 /* make sure key is allowed */
520 if (key_blob == NULL || key_bloblen != bloblen ||
521 memcmp(key_blob, blob, key_bloblen))
522 return (0);
523 return (1);
524}
525
526static void
527monitor_reset_key_state(void)
528{
529 /* reset state */
530 if (key_blob != NULL)
531 xfree(key_blob);
532 if (hostbased_cuser != NULL)
533 xfree(hostbased_cuser);
534 if (hostbased_chost != NULL)
535 xfree(hostbased_chost);
536 key_blob = NULL;
537 key_bloblen = 0;
538 key_blobtype = MM_NOKEY;
539 hostbased_cuser = NULL;
540 hostbased_chost = NULL;
541}
542
543int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000544mm_answer_moduli(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000545{
546 DH *dh;
547 int min, want, max;
548
549 min = buffer_get_int(m);
550 want = buffer_get_int(m);
551 max = buffer_get_int(m);
552
553 debug3("%s: got parameters: %d %d %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000554 __func__, min, want, max);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000555 /* We need to check here, too, in case the child got corrupted */
556 if (max < min || want < min || max < want)
557 fatal("%s: bad parameters: %d %d %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000558 __func__, min, want, max);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000559
560 buffer_clear(m);
561
562 dh = choose_dh(min, want, max);
563 if (dh == NULL) {
564 buffer_put_char(m, 0);
565 return (0);
566 } else {
567 /* Send first bignum */
568 buffer_put_char(m, 1);
569 buffer_put_bignum2(m, dh->p);
570 buffer_put_bignum2(m, dh->g);
571
572 DH_free(dh);
573 }
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000574 mm_request_send(sock, MONITOR_ANS_MODULI, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000575 return (0);
576}
577
578int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000579mm_answer_sign(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000580{
581 Key *key;
582 u_char *p;
583 u_char *signature;
584 u_int siglen, datlen;
585 int keyid;
586
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000587 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000588
589 keyid = buffer_get_int(m);
590 p = buffer_get_string(m, &datlen);
591
Damien Millera63128d2006-03-15 12:08:28 +1100592 /*
Damien Millerc91e5562006-03-26 13:58:55 +1100593 * Supported KEX types will only return SHA1 (20 byte) or
Damien Millera63128d2006-03-15 12:08:28 +1100594 * SHA256 (32 byte) hashes
595 */
596 if (datlen != 20 && datlen != 32)
Ben Lindstromd5502182002-06-27 00:12:57 +0000597 fatal("%s: data length incorrect: %u", __func__, datlen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000598
Ben Lindstromf67e0772002-06-06 20:58:19 +0000599 /* save session id, it will be passed on the first call */
600 if (session_id2_len == 0) {
601 session_id2_len = datlen;
602 session_id2 = xmalloc(session_id2_len);
603 memcpy(session_id2, p, session_id2_len);
604 }
605
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000606 if ((key = get_hostkey_by_index(keyid)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000607 fatal("%s: no hostkey from index %d", __func__, keyid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000608 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000609 fatal("%s: key_sign failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000610
Ben Lindstromd5502182002-06-27 00:12:57 +0000611 debug3("%s: signature %p(%u)", __func__, signature, siglen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000612
613 buffer_clear(m);
614 buffer_put_string(m, signature, siglen);
615
616 xfree(p);
617 xfree(signature);
618
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000619 mm_request_send(sock, MONITOR_ANS_SIGN, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000620
621 /* Turn on permissions for getpwnam */
622 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
623
624 return (0);
625}
626
627/* Retrieves the password entry and also checks if the user is permitted */
628
629int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000630mm_answer_pwnamallow(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000631{
Darren Tuckerb09b6772004-06-22 15:06:46 +1000632 char *username;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000633 struct passwd *pwent;
634 int allowed = 0;
635
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000636 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000637
638 if (authctxt->attempt++ != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000639 fatal("%s: multiple attempts for getpwnam", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000640
Darren Tuckerb09b6772004-06-22 15:06:46 +1000641 username = buffer_get_string(m, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000642
Darren Tuckerb09b6772004-06-22 15:06:46 +1000643 pwent = getpwnamallow(username);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000644
Darren Tuckerb09b6772004-06-22 15:06:46 +1000645 authctxt->user = xstrdup(username);
646 setproctitle("%s [priv]", pwent ? username : "unknown");
647 xfree(username);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000648
649 buffer_clear(m);
650
651 if (pwent == NULL) {
652 buffer_put_char(m, 0);
Damien Millerf96d1832003-11-18 22:01:48 +1100653 authctxt->pw = fakepw();
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000654 goto out;
655 }
656
657 allowed = 1;
658 authctxt->pw = pwent;
659 authctxt->valid = 1;
660
661 buffer_put_char(m, 1);
662 buffer_put_string(m, pwent, sizeof(struct passwd));
663 buffer_put_cstring(m, pwent->pw_name);
664 buffer_put_cstring(m, "*");
665 buffer_put_cstring(m, pwent->pw_gecos);
Kevin Steves7e147602002-03-22 18:07:17 +0000666#ifdef HAVE_PW_CLASS_IN_PASSWD
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000667 buffer_put_cstring(m, pwent->pw_class);
Kevin Steves7e147602002-03-22 18:07:17 +0000668#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000669 buffer_put_cstring(m, pwent->pw_dir);
670 buffer_put_cstring(m, pwent->pw_shell);
Darren Tucker2f8b3d92007-12-02 23:02:15 +1100671
672 out:
Darren Tucker1629c072007-02-19 22:25:37 +1100673 buffer_put_string(m, &options, sizeof(options));
674 if (options.banner != NULL)
675 buffer_put_cstring(m, options.banner);
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000676 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000677 mm_request_send(sock, MONITOR_ANS_PWNAM, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000678
679 /* For SSHv1 allow authentication now */
680 if (!compat20)
681 monitor_permit_authentications(1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000682 else {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000683 /* Allow service/style information on the auth context */
684 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000685 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
686 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000687
Damien Millera33501b2002-05-08 12:24:42 +1000688#ifdef USE_PAM
Damien Miller4e448a32003-05-14 15:11:48 +1000689 if (options.use_pam)
690 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
Damien Millera33501b2002-05-08 12:24:42 +1000691#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000692
693 return (0);
694}
695
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000696int mm_answer_auth2_read_banner(int sock, Buffer *m)
Damien Miller5ad9fd92002-05-13 11:07:41 +1000697{
698 char *banner;
699
700 buffer_clear(m);
701 banner = auth2_read_banner();
702 buffer_put_cstring(m, banner != NULL ? banner : "");
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000703 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000704
705 if (banner != NULL)
Ben Lindstromeec16fc2002-07-04 00:06:15 +0000706 xfree(banner);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000707
708 return (0);
709}
710
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000711int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000712mm_answer_authserv(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000713{
714 monitor_permit_authentications(1);
715
716 authctxt->service = buffer_get_string(m, NULL);
717 authctxt->style = buffer_get_string(m, NULL);
718 debug3("%s: service=%s, style=%s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000719 __func__, authctxt->service, authctxt->style);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000720
721 if (strlen(authctxt->style) == 0) {
722 xfree(authctxt->style);
723 authctxt->style = NULL;
724 }
725
726 return (0);
727}
728
729int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000730mm_answer_authpassword(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000731{
732 static int call_count;
733 char *passwd;
Ben Lindstrom7cea16b2002-07-23 21:13:40 +0000734 int authenticated;
735 u_int plen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000736
737 passwd = buffer_get_string(m, &plen);
738 /* Only authenticate if the context is valid */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000739 authenticated = options.password_authentication &&
Damien Miller856f0be2003-09-03 07:32:45 +1000740 auth_password(authctxt, passwd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000741 memset(passwd, 0, strlen(passwd));
742 xfree(passwd);
743
744 buffer_clear(m);
745 buffer_put_int(m, authenticated);
746
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000747 debug3("%s: sending result %d", __func__, authenticated);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000748 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000749
750 call_count++;
751 if (plen == 0 && call_count == 1)
752 auth_method = "none";
753 else
754 auth_method = "password";
755
756 /* Causes monitor loop to terminate if authenticated */
757 return (authenticated);
758}
759
760#ifdef BSD_AUTH
761int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000762mm_answer_bsdauthquery(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000763{
764 char *name, *infotxt;
765 u_int numprompts;
766 u_int *echo_on;
767 char **prompts;
Damien Millerb7df3af2003-02-24 11:55:46 +1100768 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000769
Damien Millerb7df3af2003-02-24 11:55:46 +1100770 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
771 &prompts, &echo_on) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000772
773 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +1100774 buffer_put_int(m, success);
775 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000776 buffer_put_cstring(m, prompts[0]);
777
Damien Millerb7df3af2003-02-24 11:55:46 +1100778 debug3("%s: sending challenge success: %u", __func__, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000779 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000780
Damien Millerb7df3af2003-02-24 11:55:46 +1100781 if (success) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000782 xfree(name);
783 xfree(infotxt);
784 xfree(prompts);
785 xfree(echo_on);
786 }
787
788 return (0);
789}
790
791int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000792mm_answer_bsdauthrespond(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000793{
794 char *response;
795 int authok;
796
797 if (authctxt->as == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000798 fatal("%s: no bsd auth session", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000799
800 response = buffer_get_string(m, NULL);
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000801 authok = options.challenge_response_authentication &&
802 auth_userresponse(authctxt->as, response, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000803 authctxt->as = NULL;
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000804 debug3("%s: <%s> = <%d>", __func__, response, authok);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000805 xfree(response);
806
807 buffer_clear(m);
808 buffer_put_int(m, authok);
809
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000810 debug3("%s: sending authenticated: %d", __func__, authok);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000811 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000812
813 auth_method = "bsdauth";
814
815 return (authok != 0);
816}
817#endif
818
819#ifdef SKEY
820int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000821mm_answer_skeyquery(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000822{
823 struct skey skey;
824 char challenge[1024];
Damien Millerb7df3af2003-02-24 11:55:46 +1100825 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000826
Darren Tucker06a8cfe2004-04-14 17:24:30 +1000827 success = _compat_skeychallenge(&skey, authctxt->user, challenge,
828 sizeof(challenge)) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000829
830 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +1100831 buffer_put_int(m, success);
832 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000833 buffer_put_cstring(m, challenge);
834
Damien Millerb7df3af2003-02-24 11:55:46 +1100835 debug3("%s: sending challenge success: %u", __func__, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000836 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000837
838 return (0);
839}
840
841int
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000842mm_answer_skeyrespond(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000843{
844 char *response;
845 int authok;
846
847 response = buffer_get_string(m, NULL);
848
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000849 authok = (options.challenge_response_authentication &&
850 authctxt->valid &&
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000851 skey_haskey(authctxt->pw->pw_name) == 0 &&
852 skey_passcheck(authctxt->pw->pw_name, response) != -1);
853
854 xfree(response);
855
856 buffer_clear(m);
857 buffer_put_int(m, authok);
858
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000859 debug3("%s: sending authenticated: %d", __func__, authok);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000860 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000861
862 auth_method = "skey";
863
864 return (authok != 0);
865}
866#endif
867
Damien Miller79418552002-04-23 20:28:48 +1000868#ifdef USE_PAM
869int
Darren Tucker7eda5922004-06-22 13:22:50 +1000870mm_answer_pam_start(int sock, Buffer *m)
Damien Miller79418552002-04-23 20:28:48 +1000871{
Damien Miller4e448a32003-05-14 15:11:48 +1000872 if (!options.use_pam)
873 fatal("UsePAM not set, but ended up in %s anyway", __func__);
874
Darren Tuckerdbf7a742004-03-08 23:04:06 +1100875 start_pam(authctxt);
Damien Miller79418552002-04-23 20:28:48 +1000876
Damien Miller1f499fd2003-08-25 13:08:49 +1000877 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
878
Damien Miller79418552002-04-23 20:28:48 +1000879 return (0);
880}
Damien Miller4f9f42a2003-05-10 19:28:02 +1000881
Damien Miller1f499fd2003-08-25 13:08:49 +1000882int
Darren Tucker7eda5922004-06-22 13:22:50 +1000883mm_answer_pam_account(int sock, Buffer *m)
Damien Miller1f499fd2003-08-25 13:08:49 +1000884{
885 u_int ret;
Damien Miller787b2ec2003-11-21 23:56:47 +1100886
Damien Miller1f499fd2003-08-25 13:08:49 +1000887 if (!options.use_pam)
888 fatal("UsePAM not set, but ended up in %s anyway", __func__);
889
890 ret = do_pam_account();
891
892 buffer_put_int(m, ret);
Darren Tuckerd4f04ae2005-09-30 10:23:21 +1000893 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
Damien Miller1f499fd2003-08-25 13:08:49 +1000894
Darren Tucker7eda5922004-06-22 13:22:50 +1000895 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
Damien Miller1f499fd2003-08-25 13:08:49 +1000896
897 return (ret);
898}
899
Damien Miller4f9f42a2003-05-10 19:28:02 +1000900static void *sshpam_ctxt, *sshpam_authok;
901extern KbdintDevice sshpam_device;
902
903int
Darren Tucker7eda5922004-06-22 13:22:50 +1000904mm_answer_pam_init_ctx(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000905{
906
907 debug3("%s", __func__);
908 authctxt->user = buffer_get_string(m, NULL);
909 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
910 sshpam_authok = NULL;
911 buffer_clear(m);
912 if (sshpam_ctxt != NULL) {
913 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
914 buffer_put_int(m, 1);
915 } else {
916 buffer_put_int(m, 0);
917 }
Darren Tucker7eda5922004-06-22 13:22:50 +1000918 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000919 return (0);
920}
921
922int
Darren Tucker7eda5922004-06-22 13:22:50 +1000923mm_answer_pam_query(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000924{
925 char *name, *info, **prompts;
Damien Miller04b65332005-07-17 17:53:31 +1000926 u_int i, num, *echo_on;
927 int ret;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000928
929 debug3("%s", __func__);
930 sshpam_authok = NULL;
931 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
932 if (ret == 0 && num == 0)
933 sshpam_authok = sshpam_ctxt;
934 if (num > 1 || name == NULL || info == NULL)
935 ret = -1;
936 buffer_clear(m);
937 buffer_put_int(m, ret);
938 buffer_put_cstring(m, name);
939 xfree(name);
940 buffer_put_cstring(m, info);
941 xfree(info);
942 buffer_put_int(m, num);
943 for (i = 0; i < num; ++i) {
944 buffer_put_cstring(m, prompts[i]);
945 xfree(prompts[i]);
946 buffer_put_int(m, echo_on[i]);
947 }
948 if (prompts != NULL)
949 xfree(prompts);
950 if (echo_on != NULL)
951 xfree(echo_on);
Darren Tuckerf14b2aa2006-05-21 18:26:40 +1000952 auth_method = "keyboard-interactive/pam";
Darren Tucker7eda5922004-06-22 13:22:50 +1000953 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000954 return (0);
955}
956
957int
Darren Tucker7eda5922004-06-22 13:22:50 +1000958mm_answer_pam_respond(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000959{
960 char **resp;
Damien Miller04b65332005-07-17 17:53:31 +1000961 u_int i, num;
962 int ret;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000963
964 debug3("%s", __func__);
965 sshpam_authok = NULL;
966 num = buffer_get_int(m);
967 if (num > 0) {
Darren Tuckerd8093e42006-05-04 16:24:34 +1000968 resp = xcalloc(num, sizeof(char *));
Damien Miller4f9f42a2003-05-10 19:28:02 +1000969 for (i = 0; i < num; ++i)
970 resp[i] = buffer_get_string(m, NULL);
971 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
972 for (i = 0; i < num; ++i)
973 xfree(resp[i]);
974 xfree(resp);
975 } else {
976 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
977 }
978 buffer_clear(m);
979 buffer_put_int(m, ret);
Darren Tucker7eda5922004-06-22 13:22:50 +1000980 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000981 auth_method = "keyboard-interactive/pam";
982 if (ret == 0)
983 sshpam_authok = sshpam_ctxt;
984 return (0);
985}
986
987int
Darren Tucker7eda5922004-06-22 13:22:50 +1000988mm_answer_pam_free_ctx(int sock, Buffer *m)
Damien Miller4f9f42a2003-05-10 19:28:02 +1000989{
990
991 debug3("%s", __func__);
992 (sshpam_device.free_ctx)(sshpam_ctxt);
993 buffer_clear(m);
Darren Tucker7eda5922004-06-22 13:22:50 +1000994 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
Darren Tuckerf14b2aa2006-05-21 18:26:40 +1000995 auth_method = "keyboard-interactive/pam";
Damien Miller4f9f42a2003-05-10 19:28:02 +1000996 return (sshpam_authok == sshpam_ctxt);
997}
Damien Miller79418552002-04-23 20:28:48 +1000998#endif
999
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001000static void
1001mm_append_debug(Buffer *m)
1002{
1003 if (auth_debug_init && buffer_len(&auth_debug)) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001004 debug3("%s: Appending debug messages for child", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001005 buffer_append(m, buffer_ptr(&auth_debug),
1006 buffer_len(&auth_debug));
1007 buffer_clear(&auth_debug);
1008 }
1009}
1010
1011int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001012mm_answer_keyallowed(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001013{
1014 Key *key;
Damien Millera10f5612002-09-12 09:49:15 +10001015 char *cuser, *chost;
1016 u_char *blob;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001017 u_int bloblen;
1018 enum mm_keytype type = 0;
1019 int allowed = 0;
1020
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001021 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001022
1023 type = buffer_get_int(m);
1024 cuser = buffer_get_string(m, NULL);
1025 chost = buffer_get_string(m, NULL);
1026 blob = buffer_get_string(m, &bloblen);
1027
1028 key = key_from_blob(blob, bloblen);
1029
1030 if ((compat20 && type == MM_RSAHOSTKEY) ||
1031 (!compat20 && type != MM_RSAHOSTKEY))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001032 fatal("%s: key type and protocol mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001033
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001034 debug3("%s: key_from_blob: %p", __func__, key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001035
Damien Miller3e3b5142003-11-17 21:13:40 +11001036 if (key != NULL && authctxt->valid) {
Darren Tucker47eede72005-03-14 23:08:12 +11001037 switch (type) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001038 case MM_USERKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001039 allowed = options.pubkey_authentication &&
1040 user_key_allowed(authctxt->pw, key);
Damien Miller7a8f5b32006-03-31 23:14:23 +11001041 auth_method = "publickey";
Darren Tuckerf2c16d32008-06-14 08:59:49 +10001042 if (options.pubkey_authentication && allowed != 1)
1043 auth_clear_options();
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001044 break;
1045 case MM_HOSTKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001046 allowed = options.hostbased_authentication &&
1047 hostbased_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001048 cuser, chost, key);
Damien Miller7a8f5b32006-03-31 23:14:23 +11001049 auth_method = "hostbased";
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001050 break;
1051 case MM_RSAHOSTKEY:
1052 key->type = KEY_RSA1; /* XXX */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001053 allowed = options.rhosts_rsa_authentication &&
1054 auth_rhosts_rsa_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001055 cuser, chost, key);
Darren Tuckerf2c16d32008-06-14 08:59:49 +10001056 if (options.rhosts_rsa_authentication && allowed != 1)
1057 auth_clear_options();
Damien Miller7a8f5b32006-03-31 23:14:23 +11001058 auth_method = "rsa";
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001059 break;
1060 default:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001061 fatal("%s: unknown key type %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001062 break;
1063 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001064 }
Damien Miller00111382003-03-10 11:21:17 +11001065 if (key != NULL)
1066 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001067
1068 /* clear temporarily storage (used by verify) */
1069 monitor_reset_key_state();
1070
1071 if (allowed) {
1072 /* Save temporarily for comparison in verify */
1073 key_blob = blob;
1074 key_bloblen = bloblen;
1075 key_blobtype = type;
1076 hostbased_cuser = cuser;
1077 hostbased_chost = chost;
Damien Miller96937bd2006-03-26 14:01:54 +11001078 } else {
Damien Miller7a8f5b32006-03-31 23:14:23 +11001079 /* Log failed attempt */
1080 auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : "");
Damien Miller96937bd2006-03-26 14:01:54 +11001081 xfree(blob);
1082 xfree(cuser);
1083 xfree(chost);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001084 }
1085
1086 debug3("%s: key %p is %s",
Darren Tucker2784f1f2008-07-04 13:51:45 +10001087 __func__, key, allowed ? "allowed" : "not allowed");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001088
1089 buffer_clear(m);
1090 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +11001091 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001092
1093 mm_append_debug(m);
1094
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001095 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001096
1097 if (type == MM_RSAHOSTKEY)
1098 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1099
1100 return (0);
1101}
1102
1103static int
1104monitor_valid_userblob(u_char *data, u_int datalen)
1105{
1106 Buffer b;
Damien Millera10f5612002-09-12 09:49:15 +10001107 char *p;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001108 u_int len;
1109 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001110
1111 buffer_init(&b);
1112 buffer_append(&b, data, datalen);
1113
1114 if (datafellows & SSH_OLD_SESSIONID) {
Ben Lindstromf67e0772002-06-06 20:58:19 +00001115 p = buffer_ptr(&b);
1116 len = buffer_len(&b);
1117 if ((session_id2 == NULL) ||
1118 (len < session_id2_len) ||
1119 (memcmp(p, session_id2, session_id2_len) != 0))
1120 fail++;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001121 buffer_consume(&b, session_id2_len);
1122 } else {
Ben Lindstromf67e0772002-06-06 20:58:19 +00001123 p = buffer_get_string(&b, &len);
1124 if ((session_id2 == NULL) ||
1125 (len != session_id2_len) ||
1126 (memcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001127 fail++;
Ben Lindstromf67e0772002-06-06 20:58:19 +00001128 xfree(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001129 }
1130 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1131 fail++;
1132 p = buffer_get_string(&b, NULL);
1133 if (strcmp(authctxt->user, p) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +10001134 logit("wrong user name passed to monitor: expected %s != %.100s",
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001135 authctxt->user, p);
1136 fail++;
1137 }
1138 xfree(p);
1139 buffer_skip_string(&b);
1140 if (datafellows & SSH_BUG_PKAUTH) {
1141 if (!buffer_get_char(&b))
1142 fail++;
1143 } else {
1144 p = buffer_get_string(&b, NULL);
1145 if (strcmp("publickey", p) != 0)
1146 fail++;
1147 xfree(p);
1148 if (!buffer_get_char(&b))
1149 fail++;
1150 buffer_skip_string(&b);
1151 }
1152 buffer_skip_string(&b);
1153 if (buffer_len(&b) != 0)
1154 fail++;
1155 buffer_free(&b);
1156 return (fail == 0);
1157}
1158
1159static int
Damien Millera10f5612002-09-12 09:49:15 +10001160monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
1161 char *chost)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001162{
1163 Buffer b;
Damien Millera10f5612002-09-12 09:49:15 +10001164 char *p;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001165 u_int len;
1166 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001167
1168 buffer_init(&b);
1169 buffer_append(&b, data, datalen);
1170
Ben Lindstromf67e0772002-06-06 20:58:19 +00001171 p = buffer_get_string(&b, &len);
1172 if ((session_id2 == NULL) ||
1173 (len != session_id2_len) ||
1174 (memcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001175 fail++;
Ben Lindstromf67e0772002-06-06 20:58:19 +00001176 xfree(p);
1177
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001178 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
1179 fail++;
1180 p = buffer_get_string(&b, NULL);
1181 if (strcmp(authctxt->user, p) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +10001182 logit("wrong user name passed to monitor: expected %s != %.100s",
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001183 authctxt->user, p);
1184 fail++;
1185 }
1186 xfree(p);
1187 buffer_skip_string(&b); /* service */
1188 p = buffer_get_string(&b, NULL);
1189 if (strcmp(p, "hostbased") != 0)
1190 fail++;
1191 xfree(p);
1192 buffer_skip_string(&b); /* pkalg */
1193 buffer_skip_string(&b); /* pkblob */
1194
1195 /* verify client host, strip trailing dot if necessary */
1196 p = buffer_get_string(&b, NULL);
1197 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1198 p[len - 1] = '\0';
1199 if (strcmp(p, chost) != 0)
1200 fail++;
1201 xfree(p);
1202
1203 /* verify client user */
1204 p = buffer_get_string(&b, NULL);
1205 if (strcmp(p, cuser) != 0)
1206 fail++;
1207 xfree(p);
1208
1209 if (buffer_len(&b) != 0)
1210 fail++;
1211 buffer_free(&b);
1212 return (fail == 0);
1213}
1214
1215int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001216mm_answer_keyverify(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001217{
1218 Key *key;
1219 u_char *signature, *data, *blob;
1220 u_int signaturelen, datalen, bloblen;
1221 int verified = 0;
1222 int valid_data = 0;
1223
1224 blob = buffer_get_string(m, &bloblen);
1225 signature = buffer_get_string(m, &signaturelen);
1226 data = buffer_get_string(m, &datalen);
1227
1228 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
Ben Lindstromb57a4bf2002-03-27 18:00:59 +00001229 !monitor_allowed_key(blob, bloblen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001230 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001231
1232 key = key_from_blob(blob, bloblen);
1233 if (key == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001234 fatal("%s: bad public key blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001235
1236 switch (key_blobtype) {
1237 case MM_USERKEY:
1238 valid_data = monitor_valid_userblob(data, datalen);
1239 break;
1240 case MM_HOSTKEY:
1241 valid_data = monitor_valid_hostbasedblob(data, datalen,
1242 hostbased_cuser, hostbased_chost);
1243 break;
1244 default:
1245 valid_data = 0;
1246 break;
1247 }
1248 if (!valid_data)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001249 fatal("%s: bad signature data blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001250
1251 verified = key_verify(key, signature, signaturelen, data, datalen);
1252 debug3("%s: key %p signature %s",
Darren Tuckerfbba7352006-11-07 23:16:08 +11001253 __func__, key, (verified == 1) ? "verified" : "unverified");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001254
1255 key_free(key);
1256 xfree(blob);
1257 xfree(signature);
1258 xfree(data);
1259
Ben Lindstrome1c09122002-06-23 00:38:24 +00001260 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1261
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001262 monitor_reset_key_state();
1263
1264 buffer_clear(m);
1265 buffer_put_int(m, verified);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001266 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001267
Darren Tuckerfbba7352006-11-07 23:16:08 +11001268 return (verified == 1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001269}
1270
1271static void
1272mm_record_login(Session *s, struct passwd *pw)
1273{
1274 socklen_t fromlen;
1275 struct sockaddr_storage from;
1276
1277 /*
1278 * Get IP address of client. If the connection is not a socket, let
1279 * the address be 0.0.0.0.
1280 */
1281 memset(&from, 0, sizeof(from));
Damien Millerebc23062002-09-04 16:45:09 +10001282 fromlen = sizeof(from);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001283 if (packet_connection_is_on_socket()) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001284 if (getpeername(packet_get_connection_in(),
Damien Miller9f3bd532006-03-26 14:07:52 +11001285 (struct sockaddr *)&from, &fromlen) < 0) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001286 debug("getpeername: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +10001287 cleanup_exit(255);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001288 }
1289 }
1290 /* Record that there was a login on that tty from the remote host. */
1291 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
Damien Miller3a961dc2003-06-03 10:25:48 +10001292 get_remote_name_or_ip(utmp_len, options.use_dns),
Damien Millerebc23062002-09-04 16:45:09 +10001293 (struct sockaddr *)&from, fromlen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001294}
1295
1296static void
1297mm_session_close(Session *s)
1298{
Damien Miller04bd8b02003-05-25 14:38:33 +10001299 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001300 if (s->ttyfd != -1) {
Damien Miller9ab00b42006-08-05 12:40:11 +10001301 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001302 session_pty_cleanup2(s);
1303 }
Damien Miller7207f642008-05-19 15:34:50 +10001304 session_unused(s->self);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001305}
1306
1307int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001308mm_answer_pty(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001309{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001310 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001311 Session *s;
1312 int res, fd0;
1313
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001314 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001315
1316 buffer_clear(m);
1317 s = session_new();
1318 if (s == NULL)
1319 goto error;
1320 s->authctxt = authctxt;
1321 s->pw = authctxt->pw;
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001322 s->pid = pmonitor->m_pid;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001323 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1324 if (res == 0)
1325 goto error;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001326 pty_setowner(authctxt->pw, s->tty);
1327
1328 buffer_put_int(m, 1);
1329 buffer_put_cstring(m, s->tty);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001330
1331 /* We need to trick ttyslot */
1332 if (dup2(s->ttyfd, 0) == -1)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001333 fatal("%s: dup2", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001334
1335 mm_record_login(s, authctxt->pw);
1336
1337 /* Now we can close the file descriptor again */
1338 close(0);
1339
Darren Tucker09991742004-07-17 17:05:14 +10001340 /* send messages generated by record_login */
1341 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1342 buffer_clear(&loginmsg);
1343
1344 mm_request_send(sock, MONITOR_ANS_PTY, m);
1345
Damien Miller54fd7cf2007-09-17 12:04:08 +10001346 if (mm_send_fd(sock, s->ptyfd) == -1 ||
1347 mm_send_fd(sock, s->ttyfd) == -1)
1348 fatal("%s: send fds failed", __func__);
Darren Tucker09991742004-07-17 17:05:14 +10001349
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001350 /* make sure nothing uses fd 0 */
1351 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001352 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001353 if (fd0 != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001354 error("%s: fd0 %d != 0", __func__, fd0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001355
1356 /* slave is not needed */
1357 close(s->ttyfd);
1358 s->ttyfd = s->ptyfd;
1359 /* no need to dup() because nobody closes ptyfd */
1360 s->ptymaster = s->ptyfd;
1361
Damien Miller9ab00b42006-08-05 12:40:11 +10001362 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001363
1364 return (0);
1365
1366 error:
1367 if (s != NULL)
1368 mm_session_close(s);
1369 buffer_put_int(m, 0);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001370 mm_request_send(sock, MONITOR_ANS_PTY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001371 return (0);
1372}
1373
1374int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001375mm_answer_pty_cleanup(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001376{
1377 Session *s;
1378 char *tty;
1379
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001380 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001381
1382 tty = buffer_get_string(m, NULL);
1383 if ((s = session_by_tty(tty)) != NULL)
1384 mm_session_close(s);
1385 buffer_clear(m);
1386 xfree(tty);
1387 return (0);
1388}
1389
1390int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001391mm_answer_sesskey(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001392{
1393 BIGNUM *p;
1394 int rsafail;
1395
1396 /* Turn off permissions */
Darren Tucker5b530262005-02-09 09:52:17 +11001397 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001398
1399 if ((p = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001400 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001401
1402 buffer_get_bignum2(m, p);
1403
1404 rsafail = ssh1_session_key(p);
1405
1406 buffer_clear(m);
1407 buffer_put_int(m, rsafail);
1408 buffer_put_bignum2(m, p);
1409
1410 BN_clear_free(p);
1411
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001412 mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001413
1414 /* Turn on permissions for sessid passing */
1415 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1416
1417 return (0);
1418}
1419
1420int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001421mm_answer_sessid(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001422{
1423 int i;
1424
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001425 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001426
1427 if (buffer_len(m) != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001428 fatal("%s: bad ssh1 session id", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001429 for (i = 0; i < 16; i++)
1430 session_id[i] = buffer_get_char(m);
1431
1432 /* Turn on permissions for getpwnam */
1433 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1434
1435 return (0);
1436}
1437
1438int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001439mm_answer_rsa_keyallowed(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001440{
1441 BIGNUM *client_n;
1442 Key *key = NULL;
1443 u_char *blob = NULL;
1444 u_int blen = 0;
1445 int allowed = 0;
1446
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001447 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001448
Damien Miller7a8f5b32006-03-31 23:14:23 +11001449 auth_method = "rsa";
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001450 if (options.rsa_authentication && authctxt->valid) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001451 if ((client_n = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001452 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001453 buffer_get_bignum2(m, client_n);
1454 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1455 BN_clear_free(client_n);
1456 }
1457 buffer_clear(m);
1458 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +11001459 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001460
1461 /* clear temporarily storage (used by generate challenge) */
1462 monitor_reset_key_state();
1463
1464 if (allowed && key != NULL) {
1465 key->type = KEY_RSA; /* cheat for key_to_blob */
1466 if (key_to_blob(key, &blob, &blen) == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001467 fatal("%s: key_to_blob failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001468 buffer_put_string(m, blob, blen);
1469
1470 /* Save temporarily for comparison in verify */
1471 key_blob = blob;
1472 key_bloblen = blen;
1473 key_blobtype = MM_RSAUSERKEY;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001474 }
Damien Miller00111382003-03-10 11:21:17 +11001475 if (key != NULL)
1476 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001477
1478 mm_append_debug(m);
1479
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001480 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001481
1482 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1483 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1484 return (0);
1485}
1486
1487int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001488mm_answer_rsa_challenge(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001489{
1490 Key *key = NULL;
1491 u_char *blob;
1492 u_int blen;
1493
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001494 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001495
1496 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001497 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001498 blob = buffer_get_string(m, &blen);
1499 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001500 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001501 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001502 fatal("%s: key type mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001503 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001504 fatal("%s: received bad key", __func__);
Damien Miller923e8bb2009-02-14 16:33:31 +11001505 if (key->type != KEY_RSA)
1506 fatal("%s: received bad key type %d", __func__, key->type);
1507 key->type = KEY_RSA1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001508 if (ssh1_challenge)
1509 BN_clear_free(ssh1_challenge);
1510 ssh1_challenge = auth_rsa_generate_challenge(key);
1511
1512 buffer_clear(m);
1513 buffer_put_bignum2(m, ssh1_challenge);
1514
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001515 debug3("%s sending reply", __func__);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001516 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001517
1518 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
Damien Miller00111382003-03-10 11:21:17 +11001519
1520 xfree(blob);
1521 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001522 return (0);
1523}
1524
1525int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001526mm_answer_rsa_response(int sock, Buffer *m)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001527{
1528 Key *key = NULL;
1529 u_char *blob, *response;
1530 u_int blen, len;
1531 int success;
1532
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001533 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001534
1535 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001536 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001537 if (ssh1_challenge == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001538 fatal("%s: no ssh1_challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001539
1540 blob = buffer_get_string(m, &blen);
1541 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001542 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001543 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001544 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001545 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001546 fatal("%s: received bad key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001547 response = buffer_get_string(m, &len);
1548 if (len != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001549 fatal("%s: received bad response to challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001550 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1551
Damien Miller00111382003-03-10 11:21:17 +11001552 xfree(blob);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001553 key_free(key);
1554 xfree(response);
1555
1556 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1557
1558 /* reset state */
1559 BN_clear_free(ssh1_challenge);
1560 ssh1_challenge = NULL;
1561 monitor_reset_key_state();
1562
1563 buffer_clear(m);
1564 buffer_put_int(m, success);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001565 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001566
1567 return (success);
1568}
1569
1570int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001571mm_answer_term(int sock, Buffer *req)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001572{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001573 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001574 int res, status;
1575
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001576 debug3("%s: tearing down sessions", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001577
1578 /* The child is terminating */
1579 session_destroy_all(&mm_session_close);
1580
Darren Tucker52358d62008-03-11 22:58:25 +11001581#ifdef USE_PAM
1582 if (options.use_pam)
1583 sshpam_cleanup();
1584#endif
1585
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001586 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
Ben Lindstrom47fd8112002-04-02 20:48:19 +00001587 if (errno != EINTR)
1588 exit(1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001589
1590 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1591
1592 /* Terminate process */
Darren Tucker1f8311c2004-05-13 16:39:33 +10001593 exit(res);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001594}
1595
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001596#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +11001597/* Report that an audit event occurred */
1598int
1599mm_answer_audit_event(int socket, Buffer *m)
1600{
1601 ssh_audit_event_t event;
1602
1603 debug3("%s entering", __func__);
1604
1605 event = buffer_get_int(m);
Darren Tucker269a1ea2005-02-03 00:20:53 +11001606 switch(event) {
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001607 case SSH_AUTH_FAIL_PUBKEY:
1608 case SSH_AUTH_FAIL_HOSTBASED:
1609 case SSH_AUTH_FAIL_GSSAPI:
1610 case SSH_LOGIN_EXCEED_MAXTRIES:
1611 case SSH_LOGIN_ROOT_DENIED:
1612 case SSH_CONNECTION_CLOSE:
1613 case SSH_INVALID_USER:
Darren Tucker269a1ea2005-02-03 00:20:53 +11001614 audit_event(event);
1615 break;
1616 default:
1617 fatal("Audit event type %d not permitted", event);
1618 }
1619
1620 return (0);
1621}
1622
1623int
1624mm_answer_audit_command(int socket, Buffer *m)
1625{
1626 u_int len;
1627 char *cmd;
1628
1629 debug3("%s entering", __func__);
1630 cmd = buffer_get_string(m, &len);
1631 /* sanity check command, if so how? */
1632 audit_run_command(cmd);
1633 xfree(cmd);
Darren Tucker269a1ea2005-02-03 00:20:53 +11001634 return (0);
1635}
Darren Tucker2e0cf0d2005-02-08 21:52:47 +11001636#endif /* SSH_AUDIT_EVENTS */
Darren Tucker269a1ea2005-02-03 00:20:53 +11001637
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001638void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001639monitor_apply_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001640{
1641 if (compat20) {
1642 set_newkeys(MODE_IN);
1643 set_newkeys(MODE_OUT);
1644 } else {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001645 packet_set_protocol_flags(child_state.ssh1protoflags);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001646 packet_set_encryption_key(child_state.ssh1key,
1647 child_state.ssh1keylen, child_state.ssh1cipher);
1648 xfree(child_state.ssh1key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001649 }
1650
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001651 /* for rc4 and other stateful ciphers */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001652 packet_set_keycontext(MODE_OUT, child_state.keyout);
1653 xfree(child_state.keyout);
1654 packet_set_keycontext(MODE_IN, child_state.keyin);
1655 xfree(child_state.keyin);
1656
1657 if (!compat20) {
1658 packet_set_iv(MODE_OUT, child_state.ivout);
1659 xfree(child_state.ivout);
1660 packet_set_iv(MODE_IN, child_state.ivin);
1661 xfree(child_state.ivin);
1662 }
1663
1664 memcpy(&incoming_stream, &child_state.incoming,
1665 sizeof(incoming_stream));
1666 memcpy(&outgoing_stream, &child_state.outgoing,
1667 sizeof(outgoing_stream));
1668
1669 /* Update with new address */
Damien Miller2d6b8332002-06-21 15:59:49 +10001670 if (options.compression)
1671 mm_init_compression(pmonitor->m_zlib);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001672
1673 /* Network I/O buffers */
1674 /* XXX inefficient for large buffers, need: buffer_init_from_string */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001675 buffer_clear(packet_get_input());
1676 buffer_append(packet_get_input(), child_state.input, child_state.ilen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001677 memset(child_state.input, 0, child_state.ilen);
1678 xfree(child_state.input);
1679
Darren Tuckerf7288d72009-06-21 18:12:20 +10001680 buffer_clear(packet_get_output());
1681 buffer_append(packet_get_output(), child_state.output,
1682 child_state.olen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001683 memset(child_state.output, 0, child_state.olen);
1684 xfree(child_state.output);
Darren Tuckerc5564e12009-06-21 18:53:53 +10001685
1686 /* Roaming */
1687 if (compat20)
1688 roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001689}
1690
1691static Kex *
1692mm_get_kex(Buffer *m)
1693{
1694 Kex *kex;
1695 void *blob;
1696 u_int bloblen;
1697
Damien Miller07d86be2006-03-26 14:19:21 +11001698 kex = xcalloc(1, sizeof(*kex));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001699 kex->session_id = buffer_get_string(m, &kex->session_id_len);
Ben Lindstromf67e0772002-06-06 20:58:19 +00001700 if ((session_id2 == NULL) ||
1701 (kex->session_id_len != session_id2_len) ||
1702 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1703 fatal("mm_get_get: internal error: bad session id");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001704 kex->we_need = buffer_get_int(m);
Damien Millerb062c292003-03-24 09:12:09 +11001705 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
Damien Millerf675fc42004-06-15 10:30:09 +10001706 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
Damien Millerb062c292003-03-24 09:12:09 +11001707 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
Damien Millera63128d2006-03-15 12:08:28 +11001708 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001709 kex->server = 1;
1710 kex->hostkey_type = buffer_get_int(m);
1711 kex->kex_type = buffer_get_int(m);
1712 blob = buffer_get_string(m, &bloblen);
1713 buffer_init(&kex->my);
1714 buffer_append(&kex->my, blob, bloblen);
1715 xfree(blob);
1716 blob = buffer_get_string(m, &bloblen);
1717 buffer_init(&kex->peer);
1718 buffer_append(&kex->peer, blob, bloblen);
1719 xfree(blob);
1720 kex->done = 1;
1721 kex->flags = buffer_get_int(m);
1722 kex->client_version_string = buffer_get_string(m, NULL);
1723 kex->server_version_string = buffer_get_string(m, NULL);
1724 kex->load_host_key=&get_hostkey_by_type;
1725 kex->host_key_index=&get_hostkey_index;
1726
1727 return (kex);
1728}
1729
1730/* This function requries careful sanity checking */
1731
1732void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001733mm_get_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001734{
1735 Buffer m;
1736 u_char *blob, *p;
1737 u_int bloblen, plen;
Damien Millera5539d22003-04-09 20:50:06 +10001738 u_int32_t seqnr, packets;
Damien Millerb61f3fc2008-07-11 17:36:48 +10001739 u_int64_t blocks, bytes;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001740
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001741 debug3("%s: Waiting for new keys", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001742
1743 buffer_init(&m);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001744 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001745 if (!compat20) {
1746 child_state.ssh1protoflags = buffer_get_int(&m);
1747 child_state.ssh1cipher = buffer_get_int(&m);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001748 child_state.ssh1key = buffer_get_string(&m,
1749 &child_state.ssh1keylen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001750 child_state.ivout = buffer_get_string(&m,
1751 &child_state.ivoutlen);
1752 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1753 goto skip;
1754 } else {
1755 /* Get the Kex for rekeying */
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001756 *pmonitor->m_pkex = mm_get_kex(&m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001757 }
1758
1759 blob = buffer_get_string(&m, &bloblen);
1760 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1761 xfree(blob);
1762
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001763 debug3("%s: Waiting for second key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001764 blob = buffer_get_string(&m, &bloblen);
1765 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1766 xfree(blob);
1767
1768 /* Now get sequence numbers for the packets */
Damien Millera5539d22003-04-09 20:50:06 +10001769 seqnr = buffer_get_int(&m);
1770 blocks = buffer_get_int64(&m);
1771 packets = buffer_get_int(&m);
Damien Millerb61f3fc2008-07-11 17:36:48 +10001772 bytes = buffer_get_int64(&m);
1773 packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes);
Damien Millera5539d22003-04-09 20:50:06 +10001774 seqnr = buffer_get_int(&m);
1775 blocks = buffer_get_int64(&m);
1776 packets = buffer_get_int(&m);
Damien Millerb61f3fc2008-07-11 17:36:48 +10001777 bytes = buffer_get_int64(&m);
1778 packet_set_state(MODE_IN, seqnr, blocks, packets, bytes);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001779
1780 skip:
1781 /* Get the key context */
1782 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1783 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1784
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001785 debug3("%s: Getting compression state", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001786 /* Get compression state */
1787 p = buffer_get_string(&m, &plen);
1788 if (plen != sizeof(child_state.outgoing))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001789 fatal("%s: bad request size", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001790 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1791 xfree(p);
1792
1793 p = buffer_get_string(&m, &plen);
1794 if (plen != sizeof(child_state.incoming))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001795 fatal("%s: bad request size", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001796 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1797 xfree(p);
1798
1799 /* Network I/O buffers */
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001800 debug3("%s: Getting Network I/O buffers", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001801 child_state.input = buffer_get_string(&m, &child_state.ilen);
1802 child_state.output = buffer_get_string(&m, &child_state.olen);
1803
Darren Tuckerc5564e12009-06-21 18:53:53 +10001804 /* Roaming */
1805 if (compat20) {
1806 child_state.sent_bytes = buffer_get_int64(&m);
1807 child_state.recv_bytes = buffer_get_int64(&m);
1808 }
1809
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001810 buffer_free(&m);
1811}
1812
1813
1814/* Allocation functions for zlib */
1815void *
1816mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1817{
Ben Lindstrom41ee2b02002-11-09 15:47:47 +00001818 size_t len = (size_t) size * ncount;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001819 void *address;
1820
Ben Lindstrom0a4f7542002-08-20 18:36:25 +00001821 if (len == 0 || ncount > SIZE_T_MAX / size)
Damien Miller530a7542002-06-26 23:27:11 +10001822 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1823
1824 address = mm_malloc(mm, len);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001825
1826 return (address);
1827}
1828
1829void
1830mm_zfree(struct mm_master *mm, void *address)
1831{
1832 mm_free(mm, address);
1833}
1834
1835void
1836mm_init_compression(struct mm_master *mm)
1837{
1838 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1839 outgoing_stream.zfree = (free_func)mm_zfree;
1840 outgoing_stream.opaque = mm;
1841
1842 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1843 incoming_stream.zfree = (free_func)mm_zfree;
1844 incoming_stream.opaque = mm;
1845}
1846
1847/* XXX */
1848
1849#define FD_CLOSEONEXEC(x) do { \
1850 if (fcntl(x, F_SETFD, 1) == -1) \
1851 fatal("fcntl(%d, F_SETFD)", x); \
1852} while (0)
1853
1854static void
1855monitor_socketpair(int *pair)
1856{
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001857#ifdef HAVE_SOCKETPAIR
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001858 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001859 fatal("%s: socketpair", __func__);
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001860#else
1861 fatal("%s: UsePrivilegeSeparation=yes not supported",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001862 __func__);
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001863#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001864 FD_CLOSEONEXEC(pair[0]);
1865 FD_CLOSEONEXEC(pair[1]);
1866}
1867
1868#define MM_MEMSIZE 65536
1869
1870struct monitor *
1871monitor_init(void)
1872{
1873 struct monitor *mon;
1874 int pair[2];
1875
Damien Miller07d86be2006-03-26 14:19:21 +11001876 mon = xcalloc(1, sizeof(*mon));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001877
1878 monitor_socketpair(pair);
1879
1880 mon->m_recvfd = pair[0];
1881 mon->m_sendfd = pair[1];
1882
1883 /* Used to share zlib space across processes */
Damien Miller2d6b8332002-06-21 15:59:49 +10001884 if (options.compression) {
1885 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1886 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001887
Damien Miller2d6b8332002-06-21 15:59:49 +10001888 /* Compression needs to share state across borders */
1889 mm_init_compression(mon->m_zlib);
1890 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001891
1892 return mon;
1893}
1894
1895void
1896monitor_reinit(struct monitor *mon)
1897{
1898 int pair[2];
1899
1900 monitor_socketpair(pair);
1901
1902 mon->m_recvfd = pair[0];
1903 mon->m_sendfd = pair[1];
1904}
Darren Tucker0efd1552003-08-26 11:49:55 +10001905
1906#ifdef GSSAPI
1907int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001908mm_answer_gss_setup_ctx(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10001909{
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001910 gss_OID_desc goid;
Darren Tucker0efd1552003-08-26 11:49:55 +10001911 OM_uint32 major;
1912 u_int len;
1913
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001914 goid.elements = buffer_get_string(m, &len);
1915 goid.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001916
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001917 major = ssh_gssapi_server_ctx(&gsscontext, &goid);
Darren Tucker0efd1552003-08-26 11:49:55 +10001918
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001919 xfree(goid.elements);
Darren Tucker0efd1552003-08-26 11:49:55 +10001920
1921 buffer_clear(m);
1922 buffer_put_int(m, major);
1923
Damien Miller6fd6def2005-11-05 15:07:05 +11001924 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10001925
1926 /* Now we have a context, enable the step */
1927 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1928
1929 return (0);
1930}
1931
1932int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001933mm_answer_gss_accept_ctx(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10001934{
1935 gss_buffer_desc in;
1936 gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
Damien Miller6fd6def2005-11-05 15:07:05 +11001937 OM_uint32 major, minor;
Darren Tucker0efd1552003-08-26 11:49:55 +10001938 OM_uint32 flags = 0; /* GSI needs this */
Darren Tucker600ad8d2003-08-26 12:10:48 +10001939 u_int len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001940
Darren Tucker600ad8d2003-08-26 12:10:48 +10001941 in.value = buffer_get_string(m, &len);
1942 in.length = len;
Darren Tucker0efd1552003-08-26 11:49:55 +10001943 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1944 xfree(in.value);
1945
1946 buffer_clear(m);
1947 buffer_put_int(m, major);
1948 buffer_put_string(m, out.value, out.length);
1949 buffer_put_int(m, flags);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001950 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10001951
1952 gss_release_buffer(&minor, &out);
1953
Damien Miller6fd6def2005-11-05 15:07:05 +11001954 if (major == GSS_S_COMPLETE) {
Darren Tucker0efd1552003-08-26 11:49:55 +10001955 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1956 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
Damien Miller0425d402003-11-17 22:18:21 +11001957 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
Darren Tucker0efd1552003-08-26 11:49:55 +10001958 }
1959 return (0);
1960}
1961
1962int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001963mm_answer_gss_checkmic(int sock, Buffer *m)
Damien Miller0425d402003-11-17 22:18:21 +11001964{
1965 gss_buffer_desc gssbuf, mic;
1966 OM_uint32 ret;
1967 u_int len;
Damien Miller787b2ec2003-11-21 23:56:47 +11001968
Damien Miller0425d402003-11-17 22:18:21 +11001969 gssbuf.value = buffer_get_string(m, &len);
1970 gssbuf.length = len;
1971 mic.value = buffer_get_string(m, &len);
1972 mic.length = len;
Damien Miller787b2ec2003-11-21 23:56:47 +11001973
Damien Miller0425d402003-11-17 22:18:21 +11001974 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
Damien Miller787b2ec2003-11-21 23:56:47 +11001975
Damien Miller0425d402003-11-17 22:18:21 +11001976 xfree(gssbuf.value);
1977 xfree(mic.value);
Damien Miller787b2ec2003-11-21 23:56:47 +11001978
Damien Miller0425d402003-11-17 22:18:21 +11001979 buffer_clear(m);
1980 buffer_put_int(m, ret);
Damien Miller787b2ec2003-11-21 23:56:47 +11001981
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001982 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
Damien Miller787b2ec2003-11-21 23:56:47 +11001983
Damien Miller0425d402003-11-17 22:18:21 +11001984 if (!GSS_ERROR(ret))
1985 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
Damien Miller787b2ec2003-11-21 23:56:47 +11001986
Damien Miller0425d402003-11-17 22:18:21 +11001987 return (0);
1988}
1989
1990int
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001991mm_answer_gss_userok(int sock, Buffer *m)
Darren Tucker0efd1552003-08-26 11:49:55 +10001992{
1993 int authenticated;
1994
1995 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1996
1997 buffer_clear(m);
1998 buffer_put_int(m, authenticated);
1999
2000 debug3("%s: sending result %d", __func__, authenticated);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002001 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
Darren Tucker0efd1552003-08-26 11:49:55 +10002002
Damien Miller6fd6def2005-11-05 15:07:05 +11002003 auth_method = "gssapi-with-mic";
Darren Tucker0efd1552003-08-26 11:49:55 +10002004
2005 /* Monitor loop will terminate if authenticated */
2006 return (authenticated);
2007}
2008#endif /* GSSAPI */
Damien Miller01ed2272008-11-05 16:20:46 +11002009
2010#ifdef JPAKE
2011int
2012mm_answer_jpake_step1(int sock, Buffer *m)
2013{
2014 struct jpake_ctx *pctx;
2015 u_char *x3_proof, *x4_proof;
2016 u_int x3_proof_len, x4_proof_len;
2017
2018 if (!options.zero_knowledge_password_authentication)
2019 fatal("zero_knowledge_password_authentication disabled");
2020
2021 if (authctxt->jpake_ctx != NULL)
2022 fatal("%s: authctxt->jpake_ctx already set (%p)",
2023 __func__, authctxt->jpake_ctx);
2024 authctxt->jpake_ctx = pctx = jpake_new();
2025
2026 jpake_step1(pctx->grp,
2027 &pctx->server_id, &pctx->server_id_len,
2028 &pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4,
2029 &x3_proof, &x3_proof_len,
2030 &x4_proof, &x4_proof_len);
2031
2032 JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__));
2033
2034 buffer_clear(m);
2035
2036 buffer_put_string(m, pctx->server_id, pctx->server_id_len);
2037 buffer_put_bignum2(m, pctx->g_x3);
2038 buffer_put_bignum2(m, pctx->g_x4);
2039 buffer_put_string(m, x3_proof, x3_proof_len);
2040 buffer_put_string(m, x4_proof, x4_proof_len);
2041
2042 debug3("%s: sending step1", __func__);
2043 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m);
2044
2045 bzero(x3_proof, x3_proof_len);
2046 bzero(x4_proof, x4_proof_len);
2047 xfree(x3_proof);
2048 xfree(x4_proof);
2049
2050 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1);
2051 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0);
2052
2053 return 0;
2054}
2055
2056int
2057mm_answer_jpake_get_pwdata(int sock, Buffer *m)
2058{
2059 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2060 char *hash_scheme, *salt;
2061
2062 if (pctx == NULL)
2063 fatal("%s: pctx == NULL", __func__);
2064
2065 auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt);
2066
2067 buffer_clear(m);
2068 /* pctx->s is sensitive, not returned to slave */
2069 buffer_put_cstring(m, hash_scheme);
2070 buffer_put_cstring(m, salt);
2071
2072 debug3("%s: sending pwdata", __func__);
2073 mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m);
2074
2075 bzero(hash_scheme, strlen(hash_scheme));
2076 bzero(salt, strlen(salt));
2077 xfree(hash_scheme);
2078 xfree(salt);
2079
2080 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1);
2081
2082 return 0;
2083}
2084
2085int
2086mm_answer_jpake_step2(int sock, Buffer *m)
2087{
2088 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2089 u_char *x1_proof, *x2_proof, *x4_s_proof;
2090 u_int x1_proof_len, x2_proof_len, x4_s_proof_len;
2091
2092 if (pctx == NULL)
2093 fatal("%s: pctx == NULL", __func__);
2094
2095 if ((pctx->g_x1 = BN_new()) == NULL ||
2096 (pctx->g_x2 = BN_new()) == NULL)
2097 fatal("%s: BN_new", __func__);
2098 buffer_get_bignum2(m, pctx->g_x1);
2099 buffer_get_bignum2(m, pctx->g_x2);
2100 pctx->client_id = buffer_get_string(m, &pctx->client_id_len);
2101 x1_proof = buffer_get_string(m, &x1_proof_len);
2102 x2_proof = buffer_get_string(m, &x2_proof_len);
2103
2104 jpake_step2(pctx->grp, pctx->s, pctx->g_x3,
2105 pctx->g_x1, pctx->g_x2, pctx->x4,
2106 pctx->client_id, pctx->client_id_len,
2107 pctx->server_id, pctx->server_id_len,
2108 x1_proof, x1_proof_len,
2109 x2_proof, x2_proof_len,
2110 &pctx->b,
2111 &x4_s_proof, &x4_s_proof_len);
2112
2113 JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__));
2114
2115 bzero(x1_proof, x1_proof_len);
2116 bzero(x2_proof, x2_proof_len);
2117 xfree(x1_proof);
2118 xfree(x2_proof);
2119
2120 buffer_clear(m);
2121
2122 buffer_put_bignum2(m, pctx->b);
2123 buffer_put_string(m, x4_s_proof, x4_s_proof_len);
2124
2125 debug3("%s: sending step2", __func__);
2126 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m);
2127
2128 bzero(x4_s_proof, x4_s_proof_len);
2129 xfree(x4_s_proof);
2130
2131 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1);
2132
2133 return 0;
2134}
2135
2136int
2137mm_answer_jpake_key_confirm(int sock, Buffer *m)
2138{
2139 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2140 u_char *x2_s_proof;
2141 u_int x2_s_proof_len;
2142
2143 if (pctx == NULL)
2144 fatal("%s: pctx == NULL", __func__);
2145
2146 if ((pctx->a = BN_new()) == NULL)
2147 fatal("%s: BN_new", __func__);
2148 buffer_get_bignum2(m, pctx->a);
2149 x2_s_proof = buffer_get_string(m, &x2_s_proof_len);
2150
2151 jpake_key_confirm(pctx->grp, pctx->s, pctx->a,
2152 pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2,
2153 pctx->server_id, pctx->server_id_len,
2154 pctx->client_id, pctx->client_id_len,
2155 session_id2, session_id2_len,
2156 x2_s_proof, x2_s_proof_len,
2157 &pctx->k,
2158 &pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len);
2159
2160 JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__));
2161
2162 bzero(x2_s_proof, x2_s_proof_len);
2163 buffer_clear(m);
2164
2165 /* pctx->k is sensitive, not sent */
2166 buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len);
2167
2168 debug3("%s: sending confirmation hash", __func__);
2169 mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m);
2170
2171 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1);
2172
2173 return 0;
2174}
2175
2176int
2177mm_answer_jpake_check_confirm(int sock, Buffer *m)
2178{
2179 int authenticated = 0;
2180 u_char *peer_confirm_hash;
2181 u_int peer_confirm_hash_len;
2182 struct jpake_ctx *pctx = authctxt->jpake_ctx;
2183
2184 if (pctx == NULL)
2185 fatal("%s: pctx == NULL", __func__);
2186
2187 peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len);
2188
2189 authenticated = jpake_check_confirm(pctx->k,
2190 pctx->client_id, pctx->client_id_len,
2191 session_id2, session_id2_len,
2192 peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid;
2193
2194 JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__));
2195
2196 bzero(peer_confirm_hash, peer_confirm_hash_len);
2197 xfree(peer_confirm_hash);
2198
2199 buffer_clear(m);
2200 buffer_put_int(m, authenticated);
2201
2202 debug3("%s: sending result %d", __func__, authenticated);
2203 mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m);
2204
2205 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1);
2206
2207 auth_method = "jpake-01@openssh.com";
2208 return authenticated;
2209}
2210
2211#endif /* JPAKE */